Study On Percolation Theory Of Volcanic Gas Reservoir

In recent years, as the demand for oil and gas resources at home and abroad increased, non-conventional natural gas reserviors in the study also gradually be taken seriously, and the volcanic gas reservoir is one of the main part. Because of its uniqueness and complexity of the gas flow, gas reservoir development process will be effected by starting pressure gradient, Klinkenberg effects and the stress-sensitive. These factors have a strong non-linear, result in gas reservoir seepage of understanding of the law caused great difficulties. The purpose of this paper is to find volcanic gas reservoir seepage law under the influence of these complex factors, and prepare for more scientific development of such non-conventional natural gas reservior.This dissertation is one part of Natural Science Foundation project "the complexity of volcanic gas reservoir percolation theory study". By the background of a a typical gas reservoir - Daqing Xushen gas field, from the gas reservoir and the geological features of the basic dynamic characteristics of production and development, combined with experimental start-up pressure gradient, Klinkenberg effects and stress-sensitive data, defined the conditions for the existence of three factors, the scope of the use of experimental data by its change of return for the back in preparation for numerical simulation of a single well. At the same time, studied the volcanic gas reservoir dual-media system with the matrix cracks in the exhaust for a variety of ways, including the role of the traditional pressure (crossflow), imbibition, the concentration of proliferation, as well as the expansion of non-Darcy flow effect, be a variety of ways for the effects of exhaust and size. And then combination of material conservation principle, the establishment of a single and integrated the three factors to consider dual media air-water two-phase flow of two-dimensional mathematical model, and the use of finite difference numerical difference method; decomposition model, the eight kinds of different factors to consider combination of circumstances the percolation model, in order to fully study the law of volcanic gas reservoir in preparation for seepage. By using VB6.0 programming software development using a numerical flow volcanic gas reservoir simulator, taking into account different models, different internal and external borders, a different system of production and development effects. On this basis, combined with the actual field in Daqing Xushen gas well data, to carry out numerical simulation of single-well analysis, to verify the results of research in this paper, and improve the establishment of the percolation model.Through the thesis research, we understand that the further defined volcanic gas reservoirs in the specificity and complexity, and the use of a variety of factors to consider the complexity of percolation model to better characterize the different volcanic gas reservoir reservoir seepage under the conditions of the law, as well as the gas reservoir effect of production and development; the single-well gas well in light of the actual numerical simulation, validation and refinement of a mathematical model of percolation, has been a complete complex of volcanic gas reservoir percolation mechanism for scientific and rational and efficient development of such a solid gas reservoir the theoretical basis.